WONDER #1821: Why Do Drink Lids Have Extra Holes?

Question 1 of 3

The second, tiny hole in plastic coffee cup lids allows liquids to flow more smoothly through the large hole because it allows what to enter the cup?

  1. air
  2. sand
  3. water
  4. coffee

Question 2 of 3

In addition to allowing air to enter a cup, the second, tiny hole in plastic coffee cup lids also allows what to escape from inside the cup?

  1. sand
  2. water
  3. coffee
  4. steam

Question 3 of 3

During which decade were great strides made in coffee cup lid design?

  1. 1880s
  2. 1920s
  3. 1950s
  4. 1980s

Check your answers online at https://www.wonderopolis.org/wonder/why-do-drink-lids-have-extra-holes.